Condenser for zinc vapors from electric furnaces



June 4, 1929. F. THARALDSEN CONDENSER FOR ZINC VAPORS FROM ELECTRIC FURNACES Filed June 26, 1923 UNITED STATES PATENT OFFICE.

i FILIP 'rHAaALnsmi, or ciims'rmnu, NORWAY. I

CONDENSER FOR ZINC VAPORS FROM ELECTRIC FURNACES.

Application filed June 26, 1923, Serial 1V0. 647,948, and in Norway November 3, 1921. In the U. S. Patent No. 1,417,953,aprocess may be installed communicating with a for condensing zinc vapors is disclosed, acboiler (not shown in the drawing cording to which the metal vapors together From the construction illustrated and dewith the noncondensable gases are passed scribed it will be noted that the'condensing 5 through inclined condenser tubes or chantubes or channels are narrow and deep and nels arranged one after another, so that a decidedly inclined, to obtain a maximum continuous-condenser channel is formed. In eflicienc forv condensers for electric zinc dispractice this condenser will brin about certilling urnaces. The combination of great tain inconveniences, especially because the depth and inclination, preferably associated 1o condenser must have a disproportionately with small width, gives a maximum of efiigreat length in order to afford a sufficient ciency, and has reduced .the formation of cooling surface. blue powder by these electric furnaces.

In the condenser that is the object of my While the ordinary muflle furnace of good present invention the said disadvantage is construction will give only about 10% of 15 obviated by using several parallel condenser powder and 90% spelter, the electric furtubes or channels instead of one continuous naces have heretofore not been so efiicient, channel. In order to profit as much as posand by my invention I have succeeded in sible from the tendency of the zinc vapors to producing spelter well within the muffle segregate along the bottom of the tubes range. This I attribute to the deep channels 20 while the noncondensablegases gather in the and their inclination; If the channels are upper part, the tubes or channels are given not deep there is not sufficient depth to ala great height. At the same time the indilow the gases to se arate into two moving vidual channels are made relatively narrow layers through the c annels, the upper layer and are separated by a space through which of non-condensible gases poor in zinc, and 2 a refrigerating medium, such as for instance, the lower layer mainly of globules of con.-

air, may pass in order to obtain a large eflecdensed zinc. I tive cooling surface. The compact construc-' Further, it is essential to the effect of the tion of the condenser according to the prescondenser that its channels have a certain inent-invention makes it also possible to utilize clination. Only in passing such sloping 30 the heat absorbed by the cooling medium. channels the gaseous products of the furnace so In the s ace between the individual con- Will by and by segregate into a lower layer denser tu es or channels may for instance be of condensingzinc globules and an upper installed circulation-elements fora boiler. layer of mainl non-condensible gases. This The heat from the condenser channels will segregation, which essentially diminishes the 35 then be absorbed by these water-containing oxidation of the condensing zinc globules elements and be utilized for the production by the action of the non-condensible gases, of steam in the boiler. particularly of the, CO contained therein, The invention is illustrated in the an will not take place if the inclination of the nexed drawing in which: Fig. l is a longichannels exceeds a certain amount. In such 40 tudinal section on the line AA of Fig. 2 case the segregation will be impeded, beand Fig. 2 is a transverse section on the cause of the constituents of the presumed line BC--D-E of Fig. 1. two layers will be mixed during the down- From the furnace chamber -a Zinc vaward movement of the products in the chanpors and carbon monoxide are conducted nels. Moreover, such segregation cannot at through the parallel inclined condenser all be realihed, if the condenser channels are channels -b, where the zinc vapor convertical. denses and the products of condensation fall It is easily understood that in order to down into a. common container -c-. In' obtain the said segregation, the gravitation the spaces between the individual condenser which causes the sinking of the globules of 50 channels watericontaining elements d, dcondensing zinc in the channels, must neces- I claim:

A condenser for zinc vapors from electric furnaces comprising a block of deep, relatively narrow separate parallel channels spaced apart and inclined downwardly from the furnace chamber to a common container for collecting the products of condensation.

In witness whereof I aflix my signature.

FILIP THARALDSEN. 

